starting trouble backfire

In the fall gas was turned to reserve, ran dry and not realizing this I tried starting for a while before noticing fuel.

I’ve gotten it started a few times but now it does not turn over and often backfires. There is also an air of fuel after a couple times of trying to start.

It’s a 96 fourtrax 300 4×4 only really been used for plowing for the last 10 yrs or so. Kept up on oil changes and always story in doors.

Please any ideas……